Grinding and polishing apparatus



Nov. 6, 1934. H. GOLDBERG GRINDING AND POLISHING APPARATUS Filed Oct. l, 1931 2 Sheets-Sheet l lidi/Iliff;

Nov. 6, 1934. H. GoLDBr-:RG 1,979,325

GRINDING AND POLISHING APPARATUS Filed Oct. l, 1931 2 Sheets-Sheet 2 k) @WM Patented Nov. 6, 1934 4UNITED s'rn'ras PATENT OFFICE Application cacher 1, 1931. serai No. 566,201 z claims. (ci. 511m This invention relates to improvements in apparatus adapted particularly for use in grinding and polishing operations whereit is desired to use a rotary power driven member for operating I any one of a plurality of grindinglor polishing implements. Heretofore no satisfactory'apparatus has been known Whichwould permit oi'. the use of a great variety of implements adapted for polishing, grinding and the like, without the necessity of changing a great number of parts when substituting one tool for another. 'The principal object of the present invention is to provide an improved apparatus which will permit the ready substitution of one tool for another without requiring the disassembly of any considerable part of the apparatus and without requiring the maintenance of a great variety of parts. A further object of the invention is to provide improved apparatus comprising a rotary member adapted gg to receive any one of a plurality of diierent devices having identical parts to intert therewith. Another object of the invention is toV provide an improved apparatus, adapted to be driven by a rotary shaft, and including an improved spindlev 5 assembly having means for receiving and operating any one of a great variety of different devices. Other objects relate to various features of construction and arrangement which will appear more fully here.nafter.

The nature of the invention will be understood from the following specification taken with the accompanying drawings in which one embodiment of the improved spindle assembly and several forms of devices and tools for cooperation therewith, are illustrated.

In the drawings, Y

Figure 1 shows a longitudinal section of one form of the improved spindle assembly having mounted therein one form of grinding tool which o is illustrated in elevation;

Fig. 2 shows a transverse section taken on the line 2-2 of Fig. 1; A

Fig. 3 shows a transverse section taken on the line 3-3 of Fig. 1;

Fig. 4 shows an enlarged longitudinal section through a portion of a modied form of grinding or polishing implement'mounted upon an arbor adapted to be received by the spindle assembly shown in Fig. 1;

Fig. 5 shows a side elevation of a modified form of spindle, carrying a chuck having mounted therein an emery cone or polishing wheel, the chuck and a portion of the spindle being shown in section;

Fig. 6 shows an'enlarged transverse sectiontaken on the line 6--6 of Fig. 5; Y

Fig. 7 shows a side elevation of another form of arbor adapted to be received by the spindle A assembly shown in Fig. 1, 'this arbor or spindle cclamprsing a chuck in which is mounted a rotary fi e l Fig. 8 shows an enlarged longitudinal section through a portion of the chuck illustrated in Fig. '7;

Fig. 9 shows' a transverse section taken on the line 9- 9of Fig. 8;

Fig. 10 shows a side elevation of a polishing wheeladapted to be mounted in the form of spindie-chuck shown in Fig. 7;

Fig. 11 shows another form of spindle or arbor adapted to be received by the apparatus shown in Fig. 1 and having mounted therein a mandrel adapted to carry a polishing disk or the like;

Fig. 12 shows a side elevation of another form of spindle or arbor adapted to be received by the apparatus shown in Fig. 1, with the tool engaging portion thereof 'illustrated in longitudinal section; and

Fig. 13 shows an enlarged transverse section on the line 13-13 of Fig. 12.

As illustrated in the drawings, the spindle assembly, illustrated generally at 15, comprises a spindle tube 16 adapted to he mounted at the end of a ijexible driving shaft and having its outer surface longitudinally grooved as shown at 16a in order to permit it to be rmly gripped by the hands of the operator as he moves it about during the operation of polishing or grinding, for example. This tube 16 is counter-bored from its opposite ends to form two annular shoulders 16b and 16. The counter-bored portions are adapted to receive the two ball bearing assemblies l'l and 18, each of which comprises an inner ring and anouter ring with a series of spherical balls mounted between the two rings. The outer ring of one of these ball bearing assemblies 17 fits against the shoulder 16c and the inner rings of the two bearing assemblies are spaced apart by a spacing vsleeve 19 in which is mounted the spindle shaft 20. This shaft has secured thereon the inner rings of each'of the two bearing assemblies 17 and 18 and the end thereof within the'bearing 18 is internally bored as shown at 20* to receive the stem 21- of an end tting 21 which is the terminal portion of a exible shaft 22. This exible shaft is mounted within the usual complementary exible casing 23 and is adapted to be driven at its other end by a suitable source of power. The stem 21'L of the fitting '21 is provided with a iongitudinn keyway 21h which is engaged by a key 20h, formed by pressing inwardly a part of the wall of the internally bored' portion of the spindle shaft tube.

The extremity of the spindle shaft 20, within the,

nut 24, is externally threaded for-engagement by an internally threaded grease sealing nut or tube 25 which bears against the outer end of the bearing assembly 18 and extends through the nut 24 to the outer end thereof.

At the other end of the assembly 15, the spindle shaft 20 is provided with an integral head .26 having an annular shoulder 26e at its inner end which bears against the outer end of the bearing assembly 17. The tube 16 is internally threaded adjacent the bearing 17 for engagement by the inner end of a locking sleeve 27 which serves to hold the bearing assembly 17 firmly in place againstv the shoulder 15 of the tube. The head 26 is provided on opposite sides with lat faces 26b adapted to be embraced by a Wrench for holding the head and the spindle shaft against rotation and the locking sleeve 27 is provided on opposite sides with transverse slots 27b which are adapted to permit the insertion of a Wrench for this purpose. The locking sleeve 27 extends to the outerl end of and slightly beyond the head 26 and the outer end portion thereof is tapered annularly as shown at 27h. The he-ad 25 is provided with an internal tapered socket 26e which extends inwardly from the end thereof in axial alignment with the axis of the spindle shaft 20 and this socket terminates at its inner end in communication with an internally threaded tubular bore 26d. The socket 26c and the threaded bore 26d are adapted to receive cooperating parts of various spindles or arbors which are employed in the operation oi a great variety of grinding, polishing or other tools. As shown in Fig. 1, the head 26 of the spindle shaft has mounted therein the tapered shank 30a of a spindle or arbor 30 which terminates at its inner end in a cylindrical threaded portion 30b having threaded engagement with the bore 26d ofthe spindle shaft. As shown particularly in Fig. 4, the spindle 30 is provided at its other end with a cylindrical portion 30c which is externally threaded near its ends. This tubular part of the spindle is illustrated in Fig. 1 as engaging a grinding wheel or disk 31, formed of emery or the like. The disk 31 is engaged on opposite sides by washers 32 and a'nut 33 engages the threaded extremity of the spindle 3G so that the disk 3l is securely clamped between the Washers 32 with the inner washer held against the portion 3D1 'of the spindle which is provided with a hexagonal outer part adapted to be engaged by a wrench or the like for the purpose of rotating the spindle during the operation of applying a tool or removing it from the head 26 of the spindle shaft. With this arrangement of the parts, the disk 31 may be readily placed upon the spindle 36 or removed therefrom and the spindle with its supply disk may be readily inserted in or removed from the socket of the head 26. The entire assembly is compactly arranged and may be conveniently manipulated by the operator who grasps the tube 16 during the operation of moving the disk 31 over the surfaces to be ground or polished.

In Fig. 4, there is illustrated the application of the frame arbor 30 to another grinding or polishing implement 35 which, in this instance, is in the form of a cylindrical polishing wheel comprising a cylindrical rubber body 36 mounted upon a metallic tubular hub37 which receives the portion 30c of the spindle and has a threaded engagement therewith. 'Ihe hub 37 has a flange 37a at its outer end whichoverlies a washer 38 engaging the end of the rubber body 36 and a similar washer 38, located at the other end of the cylindrical body `3 6, engages the shoulder adjacent the part 30( a spindle or arbor 40 having a tapered part 40a which is identical with the part 30a of the spindle previously described and which terminates at its end in an externally threaded portion 40h adapted to engage the threaded bore 26d of the head 26.

The spindle 40 is provided at an intermediate point with a hexagonal part 40 adapted to be engaged by a Wrench or the like and the outer end thereof is in the form of a tapered member 40d which has an internaly threaded b ore 40E. This bore 40e is adapted to be engaged by any one of a variety of devices having a threaded stem. In this instance it is shown as being engaged by a collet chuck 41 which has a threaded stem 41a` engaging the bore 40e. This collet chuck has an intermediate portion 41b of hexagonal external contour for engagement by a wrench and the other end'thereof is externally threaded for engagement by a clamping sleeve 41C. The chuck has an internal bore 41d and the walls or" this bore are longitudinally split as shown at 4le so that when the locking sleeve 4lc is threaded onto the body of the chuck, it engages the outer tapered walls thereof and contracts the chuck upon a stem 42 which may have mounted upon the outer end thereof an emery cone or grind' ng body 43. With the use of this arbor 40, a great variety of grinding or polishing devices may be employed inasmuch as the chuck 41 may be replaced by a great variety of other forms of mandrels or chucks and with the employment of any chuck, a great variety of grinding or polishing bodies may be employed upon separate identical stems 42.

In Figs. 7, 8, 9 and 10 of the drawings, there is illustrated another form of arbor adapted to receive other forms of implements adapted for use in grinding, polishing or other operations. This arbor 50 has a tapered stem 50e similar to the stems 40a and BOFL previously described, and this part is adapted to engage the tapered socket 26b of the head 26 with the threaded extremity 50h forming a connection with the internally threaded bore 26d of the spindle shaft. The spindle 56, like those previously described, is provided at an intermediate point with a part 5Gc which has a hexagonal external contour for engagement by a wrench. 'I'he outer part of the spindle is in the form of a tubular member 50d which is externally threaded as shown at 50e and which is tapered toward its outer end as shown at 50f. This tubular part is provided at the inner end of the threaded portion with a series of outwardly extending apertures 50g and a longitudinal slot 50h extends longitudinally from each of these apertures to the end of the spindle. The bore of the part 50d is'adapted to receive a stern 51 which may have secured upon the outer end thereof a rotary le 52 or other body adapted to be employed in polishing or grinding operations. After placing the stem 51 in the bore of the arbor, the clamping sleeve 50j is passed onto the chuck portion of the arbor in engagement with the threaded part 50e so that its internally tapered bore engages the inclined part 50f and thereby contracts the walls of the spindle upon the stem 51 to hold it firmly in place. The rotary le 52 may be replaced by other bodies mounted upon identical stems. For example, there is illustrated in Fig. 10 a cylindrical polishing wheel 53 mounted upon a stem 54 which is identical with the stem 51, except in length.

In Fig. 11 of the drawings there is illustrated another form of spindle or arbor having a tapered part 6lla to fit the socket 26b and having a threaded portion 60b to engage the threaded bore 26d. This spindle or arbor is provided beyond the wrench engaging portion 60c with an elongated tapered shank 60d having an internally threaded bore 60e at its extremity. This bore is adapted to be threadedly engaged by the stem of a `mandrel 61 having a head 61e provided with an internally threaded bore. y This head has an outwardly extending flange 61h against which a disk 62 of emery cloth or the like is adapted to seat. The central part of this disk is engaged by a cap screw 63 which passes through a washer 64 and engages the internally threaded bore of the head 61a for clamping the polishing disk 62 firmly in place. Obviously, this disk may be replaced by other devices which could be similarly clamped in position.

In Figs. 12 and 13 of the drawings there is illustrated still another form of spindle or arbor having a tapered shank 'l0EL for engagement with the socket 26c of the head of the spindle shaft and having a threaded extremity 'Z0b for engagement with the threaded bore 26d. This spindle or arbor is provided beyond the wrench engaging portion 70 thereof with a greatly elongated stem 70d and the outer end of this part is provided with a cylindrical portion l0e adapted to have a drive iit in the hub or bore of any desired grinding or polishing tool or other implement which the operator desires to employ. This portion '10e of the spindle has a longitudinal groove 'I0t milled therein from the end of the spindle so that the cylindrical portion is capable of contraction when the hub of the working tool is driven thereon.

It will be observed that all of the spindles or arbors hereinabove described have identical tapered Shanks or stemsfor engagement with the socket in the head of the spindle shaft so that they may be readily interchanged with each other. The construction of the head and locking sleeve of the spindle shaft assembly is such that the spindle shaft may be readily held against rotation during the operation of applying or removing any desired spindle or arbor. The various spindles or arbors illustrated in the drawings are of such design that they permit the application thereto of variety of tools or implements to be employed in grinding, polishing or other operations. Itis therefore apparent that a great many operations may be carried on by the use of a single shaft assembly and that one implement may be readily removed and replaced by another without the necessity of disassembling any considerable part of the apparatus and without the necessity of employing a great variety of spare parts.

Although certain embodiments and applications of the invention have been shown and described by way of illustration, it will be understood that the invention may be constructed in various forms coming within the scope of the appended claims.

I claim:

l. The combination in apparatus of the class described, of a rotary iiexible driving shaft, a tube mounted at the end of said shaft for engagement by the hand of the operator, a spindle shaft in said tube operated by said driving shaft, a rotary head actuated by said spindle shaft and having a tapered socket provided with a threaded bore at the inner end thereof, a tool carrying spindle having a tapered part to fit said socket and a threaded projection to engage said bore, and a sleeve carried by said tube and surrounding said head, said head having iiat surfaces on opposite sides thereof for engagement by a wrench and said sleeve beingprovided with slots to permit access to said flat surfaces.

2. The combination in apparatus of the class described, of a tube adapted to be held bythe operator, spaced roller bearings mounted in said tube, a spindle shaft journaled in said roller bear ings, said spindle shaft being provided with a socket, a flexible shaft having a terminal tting engaging said socket to drive said spindle shaft, a flexible casing surrounding said flexible shaft and having a connection with the end of said tube, said spindle shaft being provided with an enlarged head at the tool end, said head being provided with a socket to receive a tool-carrying spindle, and a locking sleeve surrounding said head and detachably engaging the end of said tube for holding said spindle shaft and one of said bearings within said tube, said sleeve being provided with oppositely disposed slots and said head ed to register with said slots.

HERMAN GOLDBERG. 

